.. role:: blue
   :class: blue

Constructing a Smoothed Surface
===============================
.. _Constructing_a_Smoothed_Surface_:

.. kernel version: 118058

The function

.. code-block:: cpp

   MbResultType SplineSurfaceSmoothing( const MbSplineSurface &  surface,
                                              size_t             udegree,
                                              size_t             vdegree,
                                              MbSplineSurface *& result );

smooths a copy of the source surface.

The input parameters of the function are:

- **surface** - the source spline surface;
- **udegree** - the new order of the spline surface in the first surface parameter;
- **vdegree** - the new order of the spline surface in the second surface parameter.

The output parameter of the function is the smoothed copy of the source surface **result**.

If successful, the function returns :blue:`rt_Success`; otherwise, it returns an error code from the :ref:`MbResultType <MbResultType_>` enumeration (see *mb_operation_result.h*).

The function is declared in the file *action_direct.h*.

The function smoothes the source surface **surface** without changing its spline orders or the number of control points. The smoothing is controlled by the **udegree** and **vdegree** parameters, which must be greater than the corresponding spline orders of the source surface.

Figure shows the source NURBS surface **surface** and the smoothed surface **result**:

.. figure:: /MODELER/DIRECT_MODELING_METHODS/pictures/M.6.5.1.png
   :width: 15cm
   :align: center